I have a Perentie axe head 'cross' clamp with wingnut and two wooden handles brackets with wingnuts. Thats the same function brackets on a drivers side on a Series 2/3.
It looks so similar to the Series 2A/3 bracket, but I do see that in horizontal profile, both brackets' flat bar that bolts to the bodywork has a slight curve to match the slight curve of the Perentie bonnet aka hood.